Telit Communications S p A GE864Q2 Quadband GSM/ GPRS Module User Manual GE864 Harware User Guide

Telit Communications S.p.A. Quadband GSM/ GPRS Module GE864 Harware User Guide

User Manual

GE864-QUAD V2 Hardware User
Guide
1vv0300841 Rev.0.1 - 24/11/09
GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.0.1 24/11/09
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This document is relating to the following products:
GE864-QUAD V2
GE864-QUAD V2 Hardware User Guide
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Contents
1 Overview ...........................................................................................................................6
2 GE864-QUAD V2 Mechanical Dimensions .....................................................................7
3 GE864-QUAD V2 module connections ...........................................................................8
3.1 PIN-OUT...................................................................................................................................8
3.1.1 BGA Balls Layout........................................................................................................................... 12
4 Hardware Commands ....................................................................................................14
4.1 Turning ON the GE864-QUAD V2 module ..........................................................................14
4.2 Turning OFF the GE864-QUAD V2 ......................................................................................17
4.2.1 Hardware shutdown....................................................................................................................... 17
4.2.2 Hardware Unconditional Restart.................................................................................................... 18
5 Power Supply .................................................................................................................20
5.1 Power Supply Requirements...............................................................................................20
5.2 Power Consumption.............................................................................................................21
5.3 General Design Rules ..........................................................................................................22
5.3.1 Electrical Design Guidelines .......................................................................................................... 22
5.3.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 22
5.3.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 23
5.3.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 25
5.3.2 Thermal Design Guidelines ........................................................................................................... 26
5.3.3 Power Supply PCB layout Guidelines ........................................................................................... 27
6 Antenna...........................................................................................................................28
6.1 GSM Antenna Requirements ...............................................................................................28
6.2 GSM Antenna - PCB line Guidelines...................................................................................29
6.3 GSM Antenna - Installation Guidelines ..............................................................................30
7 Logic level specifications..............................................................................................31
7.1 Reset signal ..........................................................................................................................32
8 Serial Ports .....................................................................................................................33
8.1 MODEM SERIAL PORT.........................................................................................................33
8.2 RS232 level translation ........................................................................................................35
8.3 UART level translation .........................................................................................................37
9 Audio Section Overview ................................................................................................40
9.1 INPUT LINES (Microphone) .................................................................................................41
9.1.1 Short description............................................................................................................................ 41
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9.1.2 Input Lines Characteristics ............................................................................................................ 42
9.2 OUTPUT LINES (Speaker)....................................................................................................43
9.2.1 Short description............................................................................................................................ 43
9.2.2 Output Lines Characteristics.......................................................................................................... 44
10 General Purpose I/O.......................................................................................................45
10.1 GPIO Logic levels .............................................................................................................46
10.2 Using a GPIO Pad as INPUT.............................................................................................47
10.3 Using a GPIO Pad as OUTPUT.........................................................................................47
10.4 Using the RF Transmission Control GPIO4....................................................................47
10.5 Using the RFTXMON Output GPIO5 ................................................................................48
10.6 Using the Alarm Output GPIO6........................................................................................48
10.7 Using the Buzzer Output GPIO7 ......................................................................................48
10.8 Indication of network service availability .......................................................................50
10.9 RTC Bypass out ................................................................................................................51
10.10 External SIM Holder Implementation ..............................................................................51
11 DAC and ADC section....................................................................................................52
11.1 DAC Converter ..................................................................................................................52
11.1.1 Description..................................................................................................................................... 52
11.1.2 Enabling DAC ................................................................................................................................ 53
11.1.3 Low Pass Filter Example ............................................................................................................... 53
11.2 ADC Converter ..................................................................................................................54
11.2.1 Description..................................................................................................................................... 54
11.2.2 Using ADC Converter .................................................................................................................... 54
11.3 Mounting the GE864-QUAD V2 on your Board...............................................................55
11.3.1 General .......................................................................................................................................... 55
11.3.2 Module finishing & dimensions ...................................................................................................... 55
11.3.3 Recommended foot print for the application (GE864) ................................................................... 56
11.3.4 Debug of the GE864 in production ................................................................................................57
11.3.5 Stencil ............................................................................................................................................ 57
11.3.6 PCB pad design............................................................................................................................. 58
11.3.7 Solder paste................................................................................................................................... 59
11.3.8 GE864 Solder reflow...................................................................................................................... 60
11.4 Packing system.................................................................................................................61
11.4.1 GE864 orientation on the tray........................................................................................................ 62
11.4.2 Moisture sensibility ........................................................................................................................ 62
12 Conformity Assessment Issues....................................................................................63
13 SAFETY RECOMMANDATIONS.....................................................................................64
14 Document Change Log ..................................................................................................65
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DISCLAIMER
The information contained in this document is the proprietary information of Telit Communications
S.p.A. and its affiliates (“TELIT”). The contents are confidential and any disclosure to persons other
than the officers, employees, agents or subcontractors of the owner or licensee of this document,
without the prior written consent of Telit, is strictly prohibited.
Telit makes every effort to ensure the quality of the information it makes available. Notwithstanding the
foregoing, Telit does not make any warranty as to the information contained herein, and does not
accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the
information.
Telit disclaims any and all responsibility for the application of the devices characterized in this
document, and notes that the application of the device must comply with the safety standards of the
applicable country, and where applicable, with the relevant wiring rules.
Telit reserves the right to make modifications, additions and deletions to this document due to
typographical errors, inaccurate information, or improvements to programs and/or equipment at any
time and without notice. Such changes will, nevertheless be incorporated into new editions of this
application note.
All rights reserved.
© 2008 Telit Communications S.p.A.
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1 Overview
The aim of this document is the description of some hardware solutions useful for developing a product with the
Telit GE864-QUAD V2 module.
In this document all the basic functions of a mobile phone module will be taken into account; for each one of
them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be
avoided will be evidenced. Obviously this document cannot embrace the whole hardware solutions and products
that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the
suggested hardware configurations shall not be considered mandatory, instead the information given shall be
used as a guide and a starting point for properly developing your product with the Telit GE864-QUAD V2 module.
For further hardware details that may not be explained in this document refer to the Telit GE864-QUAD V2
Product Description document where all the hardware information is reported.
NOTICE
(EN) The integration of the GSM/GPRS GE864-QUAD V2 cellular module within user application shall be
done according to the design rules described in this manual.
(IT) L’integrazione del modulo cellulare GSM/GPRS GE864-QUAD V2 all’interno dell’applicazione
dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.
(DE) Die integration des GE864-QUAD V2 GSM/GPRS Mobilfunk-Moduls in ein Gerät muß gemäß der in
diesem Dokument beschriebenen Kunstruktionsregeln erfolgen
(SL) Integracija GSM/GPRS GE864-QUAD V2 modula v uporabniški aplikaciji bo morala upoštevati
projektna navodila, opisana v tem piročniku.
(SP) La utilización del modulo GSM/GPRS GE864-QUAD V2 debe ser conforme a los usos para los cuales
ha sido deseñado descritos en este manual del usuario.
(FR) L’intégration du module cellulaire GSM/GPRS GE864-QUAD V2 dans l’application de l’utilisateur sera
faite selon les règles de conception décrites dans ce manuel.
The information presented in this document is believed to be accurate and reliable. However, no responsibility is
assumed by Telit Communications S.p.A. for its use, nor any infringement of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent rights of
Telit Communications S.p.A. other than for circuitry embodied in Telit products. This document is subject to
change without notice.
GE864-QUAD V2
GE864-QUAD V2 Hardware User Guide
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2 GE864-QUAD V2 Mechanical
Dimensions
The Telit GE864-QUAD V2 module overall dimension are:
Length: 30 mm
Width: 30 mm
Thickness: 2.9 mm
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3 GE864-QUAD V2 module connections
3.1 PIN-OUT
Ball Signal I/O Function Internal PULL UP Type
Audio
F9 AXE I Handsfree switching 100K CMOS 2.8V
G8 MIC_HF+ AI Handsfree mic. input; phase +, nom. level
3mVrms Audio
G9 MIC_MT- AI Handset mic.signal input; phase-, nom. level
50mVrms Audio
G10 EAR_MT+ AO Handset earphone signal output, phase + Audio
J8 MIC_MT+ AI Handset mic.signal input; phase+, nom. level
50mVrms Audio
J9 MIC_HF- AI Handsfree mic.input; phase -, nom. level
3mVrms Audio
J10 EAR_HF- AO Handsfree ear output, phase - Audio
H9 EAR_MT- AO Handset earphone signal output, phase - Audio
H10 EAR_HF+ AO Handsfree ear output, phase + Audio
SIM card interface
C10 SIMCLK O External SIM signal – Clock 1,8 / 3V
C11 SIMIN I External SIM signal - Presence (active low) 47K 1,8 / 3V
D4 SIMVCC - External SIM signal – Power supply for the SIM 1,8 / 3V
D10 SIMIO I/O External SIM signal - Data I/O 1,8 / 3V
E9 SIMRST O External SIM signal – Reset 1,8 / 3V
Trace
D11 TX_TRACE O TX Data for debug monitor CMOS 2.8V
F10 RX_TRACE I RX Data for debug monitor CMOS 2.8V
Prog. / Data + HW Flow Control
B6 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V
B7 C108/DTR I Input for Data terminal ready signal (DTR) from
DTE CMOS 2.8V
D9 C109/DCD O Output for Data carrier detect signal (DCD) to
DTE CMOS 2.8V
E7 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V
E11 C107/DSR O Output for Data set ready signal (DSR) to DTE CMOS 2.8V
F7 C105/RTS I Input for Request to send signal (RTS) from
DTE CMOS 2.8V
F6 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V
H8 C104/RXD O Serial data output to DTE CMOS 2.8V
DAC and ADC
C7 DAC_OUT AO Digital/Analog converter output D/A
J11 ADC_IN1 AI Analog/Digital converter input A/D
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Ball Signal I/O Function Internal PULL UP Type
H11 ADC_IN2 AI Analog/Digital converter input A/D
Miscellaneous Functions
A2 RESET* I Reset input
D8 STAT_LED O Status indicator led CMOS 1.8V
E2 VRTC AO VRTC Power
F3 32K_IN I 32.768 KHz Square Wave Input CMOS 1.8V
J5 ON_OFF* I
Input command for switching power ON or OFF
(toggle command). The pulse to be sent to the
GE864-QUAD V2 must be equal or greater
than 1 second.
47K Pull up to VBATT
L8 PWRMON O Power ON Monitor CMOS 2.8V
L4 Antenna O Antenna output – 50 ohm RF
Telit GPIO
E6 GPIO_01 / JDR I/O Telit GPIO01 I/O pin / Jammer detect report CMOS 2.8V
H5 GPIO_02/PCM_WAO I/O Telit GPIO02 Configurable GPIO / PCM audio * CMOS 2.8V
K7 GPIO_03 / PCM_RX I/O Telit GPIO03 Configurable GPIO / PCM audio * CMOS 2.8V
B3 GPIO_04 I/O Telit GPIO04 Configurable GPIO / RF
Transmission Control CMOS 2.8V
K8 GPIO_05 / RFTXMON I/O Telit GPIO05 Configurable GPIO / Transmitter
ON monitor CMOS 2.8V
B5 GPIO_06 / ALARM I/O Telit GPIO06 Configurable GPIO / ALARM CMOS 2.8V
L9 GPIO_07 / BUZZER I/O Telit GPIO07 Configurable GPIO / Buzzer CMOS 2.8V
H3 GPIO_08 / PCM_TX I/O Telit GPIO08 Configurable GPIO / PCM audio * CMOS 2.8V
D7 GPIO_09 / PCM_CLK I/O Telit GPIO09 Configurable GPIO / PCM audio * CMOS 2.8V
Power Supply
J1 VBATT - Main power supply Power
K1 VBATT - Main power supply Power
J2 VBATT - Main power supply Power
K2 VBATT - Main power supply Power
A1 GND - Ground Power
A11 GND - Ground Power
D6 GND - Ground Power
F1 GND - Ground Power
F11 GND - Ground Power
H1 GND - Ground Power
H2 GND - Ground Power
J3 GND - Ground Power
K3 GND - Ground Power
K4 GND - Ground Power
K5 GND - Ground Power
K6 GND - Ground Power
L1 GND - Ground Power
L2 GND - Ground Power
L3 GND - Ground Power
L6 GND - Ground Power
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Ball Signal I/O Function Internal PULL UP Type
L11 GND - Ground Power
RESERVED
A3 - - Reserved
A4 - - Reserved
A5 - - Reserved
A6 - - Reserved
A7 - - Reserved
A8 - - Reserved
A9 - - Reserved
A10 - - Reserved
B1 - - Reserved
B2 - - Reserved
B4 - - Reserved
B8 - - Reserved
B9 - - Reserved
B10 - - Reserved
B11 - - Reserved
C1 - - Reserved
C2 - - Reserved
C3 - - Reserved
C4 - - Reserved
C5 - - Reserved
C6 - - Reserved
C8 - - Reserved
C9 - - Reserved
D1 - - Reserved
D2 - - Reserved
D3 - - Reserved
D5 - - Reserved
E1 - - Reserved
E3 - - Reserved
E4 - - Reserved
E5 - - Reserved
E8 - - Reserved
E10 - - Reserved
F2 - - Reserved
F4 - - Reserved
F5 - - Reserved
F8 - - Reserved
G1 - - Reserved
G2 - - Reserved
G3 - - Reserved
G4 - - Reserved
G5 - - Reserved
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Ball Signal I/O Function Internal PULL UP Type
G6 - - Reserved
G7 - - Reserved
G11 - - Reserved
H4 - - Reserved
H6 - - Reserved
H7 - - Reserved
J4 - - Reserved
J6 - - Reserved
J7 - - Reserved
K9 - - Reserved
K10 - - Reserved
K11 - - Reserved
L5 - - Reserved
L7 - - Reserved
L10 - - Reserved
* Ref. to Digital Voice Interface Application Note 80000NT10004a.
NOTE: RESERVED pins must not be connected
NOTE: If not used, almost all pins should be left disconnected. The only exceptions are the following
pins:
pin signal
J1,K1,J2,K2 VBATT
A1,F1,H1,L1,H2,L2,J3,K3,L3,
K4,K5,D6,K6,L6,A11,F11,L11
GND
J5 ON/OFF*
E7 TXD
A2 RESET*
H8 RXD
F3 32K_IN
to GND
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3.1.1 BGA Balls Layout
TOP VIEW
A B C D E F G H J K L
1 GND - - - - GND - GND VBATT VBATT GND
2 RESET* - - - VRTC - - GND VBATT VBATT GND
3 - GPIO_04 - - - 32K_IN -
GPIO_08 /
PCM_TX GND GND GND
4 -- - - SIMVCC - - - - - GND Antenna
5 - GPIO_06 /
ALARM - - - - -
GPIO_02 /
PCM_WAO ON_OFF* GND -
6 - C125/RING - GND GPIO_01 /
JDR
C106 /
CTS - - - GND GND
7 - C108 /
DTR DAC_OUT GPIO_09 /
PCM_CLK
C103 /
TXD
C105 /
RTS - - - GPIO_03/
PCM_RX -
8 - - -
STAD_
LED - - MIC_HF+ C104 /
RXD MIC_MT+ GPIO_05 /
RFTXMON PWRMON
9 - - - C109 /
DCD SIMRST AXE MIC_MT- EAR_MT- MIC_HF- -
GPIO_07 /
BUZZER
10 - - SIMCLK SIMIO - RX_TRACE EAR_MT+ EAR_HF+ EAR_HF- - -
11 GND - SIMIN TX_TRACE C107 /
DSR GND - ADC_IN2 ADC_IN1 - GND
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AUDIO Signals balls
SIM CARD interface balls
TRACE Signals balls
Prog. / data + Hw Flow Control signals balls
ADC signals balls
MISCELLANEOUS functions signals balls
TELIT GPIO balls
POWER SUPPLY VBATT balls
POWER SUPPLY GND balls
RESERVED
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4 Hardware Commands
4.1 Turning ON the GE864-QUAD V2 module
To turn on the GE864-QUAD V2 the pad ON* must be tied low for at least 1 seconds and then
released.
The maximum current that can be drained from the ON* pad is 0,1 mA.
A simple circuit to do it is:
NOTE: don't use any pull up resistor on the ON* line, it is internally pulled up. Using pull up resistor may bring to
latch up problems on the GE864-QUAD V2 power regulator and improper power on/off of the module. The line ON*
must be connected only in open collector configuration.
NOTE: In this document all the lines that are inverted, hence have active low signals are labeled with a name that
ends with a "*" .
TIP: To check if the device has powered on, the hardware line PWRMON should be monitored. After 900ms the line
raised up the device could be considered powered on.
ON*
Power ON impulse
GND
R1
R2
Q1
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A flow chart showing the proper turn on procedure is displayed below:
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For example:
1- Let's assume you need to drive the ON* pad with a totem pole output from +1.8V up to 5V
microcontroller (uP_OUT1):
2- Let's assume you need to drive the ON* pad directly with an ON/OFF button:
1s
10k
ON*
+
1.8V ... 5V
ON*
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4.2 Turning OFF the GE864-QUAD V2
The turning off of the device can be done in three ways:
by software command (see GE864-QUAD V2 Software User Guide)
by hardware shutdown
by Hardware Unconditional Restart
When the device is shut down by software command or by hardware shutdown, it issues to the
network a detach request that informs the network that the device will not be reachable any more.
4.2.1 Hardware shutdown
To turn OFF the GE864-QUAD V2 the pad ON* must be tied low for at least 2 seconds and then
released.The same circuitry and timing for the power on shall be used.
The device shuts down after the release of the ON* pad.
TIP: To check if the device has powered off, the hardware line PWRMON should be monitored. When PWRMON goes
low, the device has powered off.
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4.2.2 Hardware Unconditional Restart
To unconditionally Restart the GE864-QUAD V2, the pad RESET* must be tied low for at least 200
milliseconds and then released.A simple circuit to do it is:
The following flow chart shows the proper Reset procedure:
RESET*
Unconditional Restart
impulse
GND
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NOTE: don't use any pull up resistor on the RESET* line nor any totem pole digital output. Using pull up resistor
may bring to latch up problems on the GE864-QUAD V2 power regulator and improper functioning of the module.
The line RESET* must be connected only in open collector configuration.
TIP: The unconditional hardware Restart should be always implemented on the boards and software should use it
as an emergency exit procedure.
For example:
1- Let's assume you need to drive the RESET* pad with a totem pole output from +1.8V up to +5V
microcontroller (uP_OUT2):
NOTE: The RESET# signal is internally pulled up so the pin can be left floating if not used
10k
RESET*
1
.8V ... 5V
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5 Power Supply
The power supply circuitry and board layout are a very important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
5.1 Power Supply Requirements
POWER SUPPLY
Nominal Supply Voltage 3.8V
Max Supply Voltage 4.2V
Operating Supply Voltage Range 3.4V – 4.2V
Wide Supply Voltage tolerant 3.25V – 4.2V
TIP: the supply voltage is directly measured between VBATT and GND balls. It must stay within the Wide Supply
Voltage tolerant range including any drop voltage and overshoot voltage (during the slot tx, for example).
NOTE: The Operating Voltage Range MUST never be exceeded also in power off condition; care must be
taken in order to fulfill min/max voltage requirement
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5.2 Power Consumption
The GE864-QUAD V2 power consumptions are:
GE864-QUAD V2
Mode Average (mA) Mode description
IDLE mode Stand by mode; no call in progress
AT+CFUN=1 23,9 Normal mode: full functionality of the module
AT+CFUN=4 22 Disabled TX and RX; module is not registered on the
network
AT+CFUN=0 or
AT+CFUN=5 7,20 / 3,561
Power saving: CFUN=0 module registered on the network
and can receive voice call or an SMS; but it is not possible
to send AT commands; module wakes up with an
unsolicited code (call or SMS) or rising RTS line. CFUN=5
full functionality with power saving; module registered on
the network can receive incoming calls and SMS
RX mode
1 slot in downlink 52,3
2 slot in downlink 65,2
3 slot in downlink 78,6
4 slot in downlink 88,4
GSM Receiving data mode
GSM TX and RX mode
Min power level 78,1
Max power level 200,1
GSM Sending data mode
GPRS (class 10) TX and RX mode
Min power level 123,7
Max power level 370,8
GPRS Sending data mode
The GSM system is made in a way that the RF transmission is not continuous, else it is packed into
bursts at a base frequency of about 216 Hz, the relative current peaks can be as high as about 2A.
Therefore the power supply has to be designed in order to withstand with these current peaks without
big voltage drops; this means that both the electrical design and the board layout must be designed for
this current flow.
If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the
supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the
voltage drop during the peak current absorption is too much, then the device may even shutdown as a
consequence of the supply voltage drop.
TIP: The electrical design for the Power supply should be made ensuring it will be capable of a peak current output
of at least 2A.
1 Worst/best case depends on network configuration and is not under module control
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5.3 General Design Rules
The principal guidelines for the Power Supply Design embrace three different design steps:
the electrical design
the thermal design
the PCB layout.
5.3.1 Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source where this power is
drained. We will distinguish them into three categories:
+5V input (typically PC internal regulator output)
+12V input (typically automotive)
Battery
5.3.1.1 + 5V input Source Power Supply Design Guidelines
The desired output for the power supply is 3.8V, hence there's not a big difference between the
input source and the desired output and a linear regulator can be used. A switching power supply
will not be suited because of the low drop out requirements.
When using a linear regulator, a proper heat sink shall be provided in order to dissipate the power
generated.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks close to the GE864-QUAD V2, a 100μF tantalum capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at
least 10V.
A protection diode should be inserted close to the power input, in order to save the GE864-QUAD
V2 from power polarity inversion.
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An example of linear regulator with 5V input is:
5.3.1.2 + 12V input Source Power Supply Design Guidelines
The desired output for the power supply is 3.8V, hence due to the big difference between the input
source and the desired output, a linear regulator is not suited and shall not be used. A switching
power supply will be preferable because of its better efficiency especially with the 2A peak current
load represented by the GE864-QUAD V2.
When using a switching regulator, a 500kHz or more switching frequency regulator is preferable
because of its smaller inductor size and its faster transient response. This allows the regulator to
respond quickly to the current peaks absorption.
In any case the frequency and Switching design selection is related to the application to be
developed due to the fact the switching frequency could also generate EMC interferences.
For car PB battery the input voltage can rise up to 15,8V and this should be kept in mind when
choosing components: all components in the power supply must withstand this voltage.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks, a 100μF tantalum capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at
least 10V.
For Car applications a spike protection diode should be inserted close to the power input, in order
to clean the supply from spikes.
A protection diode should be inserted close to the power input, in order to save the GE864-QUAD
V2 from power polarity inversion. This can be the same diode as for spike protection.
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An example of switching regulator with 12V input is in the below schematic (it is split in 2 parts):
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5.3.1.3 Battery Source Power Supply Design Guidelines
The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is
4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit
GE864-QUAD V2 module.
The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE USED
DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the
GE864-QUAD V2 and damage it.
NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE864-QUAD V2. Their
use can lead to overvoltage on the GE864-QUAD V2 and damage it. USE ONLY Li-Ion battery types.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current
absorption peaks, a 100μF tantalum capacitor is usually suited.
Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.
A protection diode should be inserted close to the power input, in order to save the GE864-QUAD
V2 from power polarity inversion. Otherwise the battery connector should be done in a way to
avoid polarity inversions when connecting the battery.
The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A; the
suggested capacity is from 500mAh to 1000mAh.
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5.3.2 Thermal Design Guidelines
The thermal design for the power supply heat sink should be done with the following specifications:
Average current consumption during transmission @PWR level max: 500mA
Average current consumption during transmission @ PWR level min: 100mA
Average current during Power Saving (CFUN=5): 4mA
Average current during idle (Power Saving disabled) 24mA
NOTE: The average consumption during transmissions depends on the power level at which the device is requested
to transmit by the network. The average current consumption hence varies significantly.
Considering the very low current during idle, especially if Power Saving function is enabled, it is
possible to consider from the thermal point of view that the device absorbs current significantly only
during calls.
If we assume that the device stays into transmission for short periods of time (let's say few minutes)
and then remains for a quite long time in idle (let's say one hour), then the power supply has always
the time to cool down between the calls and the heat sink could be smaller than the calculated one for
500mA maximum RMS current, or even could be the simple chip package (no heat sink).
Moreover in the average network conditions the device is requested to transmit at a lower power level
than the maximum and hence the current consumption will be less than the 500mA, being usually
around 150mA.
For these reasons the thermal design is rarely a concern and the simple ground plane where the
power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating.
For the heat generated by the GE864-QUAD V2, you can consider it to be during transmission 1W
max during CSD/VOICE calls and 2W max during class10 GPRS upload.
This generated heat will be mostly conducted to the ground plane under the GE864-QUAD V2; you
must ensure that your application can dissipate it.
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5.3.3 Power Supply PCB layout Guidelines
As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the
output to cut the current peaks and a protection diode on the input to protect the supply from spikes
and polarity inversion. The placement of these components is crucial for the correct working of the
circuitry. A misplaced component can be useless or can even decrease the power supply
performances.
The Bypass low ESR capacitor must be placed close to the Telit GE864-QUAD V2 power input
pads or in the case the power supply is a switching type it can be placed close to the inductor to
cut the ripple provided the PCB trace from the capacitor to the GE864-QUAD V2 is wide enough to
ensure a dropless connection even during the 2A current peaks.
The protection diode must be placed close to the input connector where the power source is
drained.
The PCB traces from the input connector to the power regulator IC must be wide enough to ensure
no voltage drops occur when the 2A current peaks are absorbed. Note that this is not made in
order to save power loss but especially to avoid the voltage drops on the power line at the current
peaks frequency of 216 Hz that will reflect on all the components connected to that supply,
introducing the noise floor at the burst base frequency. For this reason while a voltage drop of 300-
400 mV may be acceptable from the power loss point of view, the same voltage drop may not be
acceptable from the noise point of view. If your application doesn't have audio interface but only
uses the data feature of the Telit GE864-QUAD V2, then this noise is not so disturbing and power
supply layout design can be more forgiving.
The PCB traces to the GE864-QUAD V2 and the Bypass capacitor must be wide enough to ensure
no significant voltage drops occur when the 2A current peaks are absorbed. This is for the same
reason as previous point. Try to keep this trace as short as possible.
The PCB traces connecting the Switching output to the inductor and the switching diode must be
kept as short as possible by placing the inductor and the diode very close to the power switching
IC (only for switching power supply). This is done in order to reduce the radiated field (noise) at the
switching frequency (100-500 kHz usually).
The use of a good common ground plane is suggested.
The placement of the power supply on the board should be done in such a way to guarantee that
the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry
as the microphone amplifier/buffer or earphone amplifier.
The power supply input cables should be kept separate from noise sensitive lines such as
microphone/earphone cables.
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6 Antenna
The antenna connection and board layout design are the most important part in the full product design
and they strongly reflect on the product overall performances, hence read carefully and follow the
requirements and the guidelines for a proper design.
6.1 GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE864-
QUAD V2 device shall fulfill the following requirements:
ANTENNA REQUIREMENTS
Frequency range Depending by frequency band(s)
provided by the network operator, the
customer shall use the most suitable
antenna for that/those band(s)
Bandwidth 70 MHz in GSM850, 80 MHz in
GSM900, 170 MHz in DCS & 140
MHz PCS band
Gain 1.4dBi @900 and 3dBi @1800
1.4dBi @850 and 3dBi @1900
Impedance 50 ohm
Input power > 2 W peak power
VSWR absolute max <= 10:1
VSWR recommended <= 2:1
When using the Telit GE864-QUAD V2, since there's no antenna connector on the module, the
antenna must be connected to the GE864-QUAD V2 through the PCB with the antenna pad.
In the case that the antenna is not directly developed on the same PCB, hence directly connected at
the antenna pad of the GE864-QUAD V2, then a PCB line is needed in order to connect with it or with
its connector.
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This line of transmission shall fulfill the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance 50 ohm
Max Attenuation 0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to
the GE864-QUAD V2 ground pins
Furthermore if the device is developed for the US market and/or Canada market, it shall comply to the
FCC and/or IC approval requirements:
This device is to be used only for mobile and fixed application. The antenna(s) used for this transmitter
must be installed to provide a separation distance of at least 20 cm from all persons and must not be
co-located or operating in conjunction with any other antenna or transmitter. End-Users must be
provided with transmitter operation conditions for satisfying RF exposure compliance. OEM integrators
must ensure that the end user has no manual instructions to remove or install the GE864-QUAD V2
module. Antennas used for this OEM module must not exceed 1.4dBi @900, 3dBi @1800, 1.4dBi
@850 and 3dBi @1900 gain for mobile and fixed operating configurations.
6.2 GSM Antenna - PCB line Guidelines
Ensure that the antenna line impedance is 50 ohm;
Keep the antenna line on the PCB as short as possible, since the antenna line loss shall be less
than 0,3 dB;
Antenna line must have uniform characteristics, constant cross section, avoid meanders and
abrupt curves;
Keep, if possible, one layer of the PCB used only for the Ground plane;
Surround (on the sides, over and under) the antenna line on PCB with Ground, avoid having other
signal tracks facing directly the antenna line track;
The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by
placing vias once per 2mm at least;
Place EM noisy devices as far as possible from GE864-QUAD V2 antenna line;
Keep the antenna line far away from the GE864-QUAD V2 power supply lines;
If you have EM noisy devices around the PCB hosting the GE864-QUAD V2, such as fast
switching ICs, take care of the shielding of the antenna line by burying it inside the layers of PCB
and surround it with Ground planes, or shield it with a metal frame cover.
If you don't have EM noisy devices around the PCB of GE864-QUAD V2, by using a strip-line on
the superficial copper layer for the antenna line, the line attenuation will be lower than a buried
one;
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6.3 GSM Antenna - Installation Guidelines
Install the antenna in a place covered by the GSM signal.
The Antenna must be installed to provide a separation distance of at least 20 cm from all persons
and must not be co-located or operating in conjunction with any other antenna or transmitter;
Antenna shall not be installed inside metal cases
Antenna shall be installed also according Antenna manufacturer instructions.
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7 Logic level specifications
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels. The following
table shows the logic level specifications used in the Telit GE864-QUAD V2 interface circuits:
Absolute Maximum Ratings
Parameter Min Max
Input level on any
digital pin when on
-0.3V +3.1V
Input voltage on
analog pins when on
-0.3V +3.0 V
Operating Range - Interface levels (2.8V CMOS)
Level Min Max
Input high level 2.1V 3.1V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 1,8V signals:
Operating Range - Interface levels (1.8V CMOS)
Level Min Max
Input high level 1.6V 2.2V
Input low level 0V 0.4V
Output high level 1,65V 2.2V
Output low level 0V 0.35V
Current characteristics
Level Typical
Output Current 1mA
Input Current 1uA
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7.1 Reset signal
Signal Function I/O Bga Ball
RESET Phone reset I A2
RESET is used to reset the GE864-QUAD V2 modules. Whenever this signal is pulled low, the GE864-
QUAD V2 is reset. When the device is reset it stops any operation. After the release of the reset
GE864-QUAD V2 is unconditionally shut down, without doing any detach operation from the network
where it is registered. This behaviour is not a proper shut down because any GSM device is requested
to issue a detach request on turn off. For this reason the Reset signal must not be used to normally
shutting down the device, but only as an emergency exit in the rare case the device remains stuck
waiting for some network response.
The RESET is internally controlled on start-up to achieve always a proper power-on reset sequence,
so there's no need to control this pin on start-up. It may only be used to reset a device already on that
is not responding to any command.
NOTE: do not use this signal to power off the GE864-QUAD V2. Use the ON/OFF signal to perform this
function or the AT#SHDN command.
Reset Signal Operating levels:
Signal Min Max
RESET Input high 2.0V* 2.2V
RESET Input low 0V 0.2V
* this signal is internally pulled up so the pin can be left floating if not used.
If unused, this signal may be left unconnected. If used, then it must always be connected with an
open collector transistor, to permit to the internal circuitry the power on reset and under voltage
lockout functions.
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8 Serial Ports
The serial port on the Telit GE864-QUAD V2 is the core of the interface between the module and OEM
hardware.
2 serial ports are available on the module:
MODEM SERIAL PORT
MODEM SERIAL PORT 2 (DEBUG)
8.1 MODEM SERIAL PORT
Several configurations can be designed for the serial port on the OEM hardware, but the most
common are:
RS232 PC com port
microcontroller UART @ 2.8V - 3V (Universal Asynchronous Receive Transmit)
microcontroller UART@ 5V or other voltages different from 2.8V
Depending from the type of serial port on the OEM hardware a level translator circuit may be needed
to make the system work. The only configuration that doesn't need a level translation is the 2.8V
UART.
The serial port on the GE864-QUAD V2 is a +2.8V UART with all the 7 RS232 signals. It differs from
the PC-RS232 in the signal polarity (RS232 is reversed) and levels. The levels for the GE864-QUAD
V2 UART are the CMOS levels:
Absolute Maximum Ratings -Not Functional
Parameter Min Max
Input level on any
digital pad when on
-0.3V +3.1V
Input voltage on
analog pads when on
-0.3V +3.0 V
Operating Range - Interface levels (2.8V CMOS)
Level Min Max
Input high level VIH 2.1V 3.1V
Input low level VIL 0V 0.5V
Output high level VOH 2.2V 3.0V
Output low level VOL 0V 0.35V
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The signals of the GE864-QUAD V2 serial port are:
RS232
Pin
Number
Signal GE864-
QUAD V2
Pad
Number
Name Usage
1 DCD - dcd_uart D9 Data Carrier Detect Output from the GE864-QUAD V2 that indicates the
carrier presence
2 RXD - tx_uart H8 Transmit line *see Note Output transmit line of GE864-QUAD V2 UART
3 TXD - rx_uart E7 Receive line *see Note Input receive of the GE864-QUAD V2 UART
4 DTR - dtr_uart B7 Data Terminal Ready Input to the GE864-QUAD V2 that controls the DTE
READY condition
5 GND A1,F1,H1
L1, H2, L2,
J3, K3….
Ground ground
6 DSR - dsr_uart E11 Data Set Ready Output from the GE864-QUAD V2 that indicates the
module is ready
7 RTS -rts_uart F7 Request to Send Input to the GE864-QUAD V2 that controls the
Hardware flow control
8 CTS - cts_uart F6 Clear to Send Output from the GE864-QUAD V2 that controls the
Hardware flow control
9 RI - ri_uart B6 Ring Indicator Output from the GE864-QUAD V2 that indicates the
incoming call condition
NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on
the GE864 side these signal are on the opposite direction: TXD on the application side will be
connected to the receive line (here named TXD/ rx_uart ) of the GE864-QUAD V2 serial port
and viceversa for RX.
TIP: For a minimum implementation, only the TXD and RXD lines can be connected, the other
lines can be left open provided a software flow control is implemented.
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8.2 RS232 level translation
In order to interface the Telit GE864-QUAD V2 with a PC com port or a RS232 (EIA/TIA-232)
application a level translator is required. This level translator must
invert the electrical signal in both directions
change the level from 0/3V to +15/-15V
Actually, the RS232 UART 16450, 16550, 16650 & 16750 chipsets accept signals with lower levels on
the RS232 side (EIA/TIA-562) , allowing for a lower voltage-multiplying ratio on the level translator.
Note that the negative signal voltage must be less than 0V and hence some sort of level translation is
always required.
The simplest way to translate the levels and invert the signal is by using a single chip level translator.
There are a multitude of them, differing in the number of driver and receiver and in the levels (be sure
to get a true RS232 level translator not a RS485 or other standards).
By convention the driver is the level translator from the 0-3V UART level to the RS232 level, while the
receiver is the translator from RS232 level to 0-3V UART.
In order to translate the whole set of control lines of the UART you will need:
5 driver
3 receiver
The digital input lines working at 2.8V CMOS have an absolute maximum input voltage of 3.0V;
therefore the level translator IC shall not be powered by the +3.8V supply of the module.
Instead, it must be powered from a +2.7V / +2.9V (dedicated) power supply.
This is because in this way the level translator IC outputs on the module side (i.e. GE865
inputs) will work at +3.8V interface levels, damaging the module inputs.
NOTE: In order to be able to do in circuit reprogramming of the GE864 firmware, the serial port
on the Telit GE864 shall be available for translation into RS232 and either it's controlling device
shall be placed into tristate, disconnected or as a gateway for the serial data when module
reprogramming occurs.
Only RXD, TXD, GND and the On/off module turn on pad are required to the reprogramming of
the module, the other lines are unused.
All applicator shall include in their design such a way of reprogramming the GE864.
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An example of level translation circuitry of this kind is:
The example is done with a SIPEX SP3282EB RS232 Transceiver that could accept supply voltages
lower than 3V DC.
In this case Vin has to be set with a value compatible with the logic levels of the module. (Ma
x
2.9V DC). In this configuration the SP3282EB will adhere to EIA/TIA-562 voltage levels instea
d
of RS232 (-5 ~ +5V)
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Second solution could be done using a MAXIM transceiver (MAX218) In this case the
compliance with RS232 (+-5V) is possible.
Another level adapting method could be done using a standard RS232 Transceiver (MAX3237EAI)
adding some resistors to adapt the levels on the GE865 Input lines.
NOTE: In this case has to be taken in account the length of the lines on the application to avoid
problems in case of High-speed rates on RS232.
The RS232 serial port lines are usually connected to a DB9 connector with the following layout:
8.3 UART
level
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translation
If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different
from 2.8 - 3V, then a circuitry has to be provided to adapt the different levels of the two set of signals.
As for the RS232 translation there are a multitude of single chip translators. For example a possible
translator circuit for a 5V TRANSMITTER/RECEIVER can be:
TIP: This logic IC for the level translator and 2.8V pull-ups (not the 5V one) can be powered directly from PWRMON
line of the GE864-QUAD V2. Note that the TC7SZ07AE has open drain output, therefore the resistor R2 is mandatory.
TO TELIT
MODULE
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NOTE: The UART input line TXD (rx_uart) of the GE864-QUAD V2 is NOT internally pulled up with a resistor, so
there may be the need to place an external 47K pull-up resistor, either the DTR (dtr_uart) and RTS (rts_uart) input
lines are not pulled up internally, so an external pull-up resistor of 47K may be required.
A power source of the internal interface voltage corresponding to the 2.8VCMOS high level is
available at the PWRMON pin on the connector, whose absolute maximum output current is 1mA.
A maximum of 9 resistors of 47 K pull-up can be connected to the PWRMON pin, provided no other
devices are connected to it and the pulled-up lines are GE864-QUAD V2 input lines connected to
open collector outputs in order to avoid latch-up problems on the GE864-QUAD V2.
Care must be taken to avoid latch-up on the GE864-QUAD V2 and the use of this output line to power
electronic devices shall be avoided, especially for devices that generate spikes and noise such as
switching level translators, micro controllers, failure in any of these condition can severely compromise
the GE864-QUAD V2 functionality.
NOTE: The input lines working at 2.8VCMOS can be pulled-up with 47K resistors that can be connected directly to
the PWRMON line provided they are connected as in this example.
NO OTHER devices than those suggested should be powered with the PWRMON line; otherwise the module
functionality may be compromised.
It is important to consider that the added circuit must have consumption lower than 1mA.
In case of reprogramming of the module has to be considered the use of the RESET line to start correctly the
activity.
The preferable configuration is having an external supply for the buffer.
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9 Audio Section Overview
The Base Band Chip of the GE864-QUAD V2 Telit Module provides two different audio blocks; both in
transmit (Uplink) and in receive (Downlink) direction:
MT lines” should be used for handset function,
HF lines” is suited for hands -free function (car kit).
These two blocks can be active only one at a time, selectable by AXE hardware line or by AT
command.The audio characteristics are equivalent in transmit blocks, but are different in the receive
ones and this should be kept in mind when designing.
GE863-GPS Audio Paths
Differential
Line-Out Drivers
Fully Differential
Power Buffers
EXTERNAL
AMPLIFIER
-12dBFS
16
8
16
+10dB
-45dBV/Pa
Mic_HF-Ear_HF-
Balanced
Single
ended
Mic_HF+Ear_HF+
50cm23mVrms
0,33mV rms
audio2.skd
GM863-GPS
+20dB
7cm-45dBV/Pa
3,3mVrms
365mVrms
Mic_MT+Ear_MT+
Mic_MT-Ear_MT-
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9.1 INPUT LINES (Microphone)
9.1.1 Short description
The Telit GE864-QUAD V2 provides two audio paths in transmit section. Only one of the two paths
can be active at a time, selectable by AXE hardware line or by AT command.
You must keep in mind the different audio characteristics of the transmit blocks when designing:
The MIC_MT audio path should be used for handset function, while the “MIC_HF audio path is
suited for hands-free function (car kit).
TIP: being the microphone circuitry the more noise sensitive, its design and layout must be
done with particular care. Both microphone paths are balanced and the OEM circuitry should
be balanced designed to reduce the common mode noise typically generated on the ground
plane. However also an unbalanced circuitry can be used for particular OEM application needs.
TIP: due to the difference in the echo canceller type, the “Mic_MT” audio path is suited for
Handset applications, while the “Mic_HF”audio path is suited for hands-free function (car kit).
The Earphone applications should be made using the “Mic_HF” audio path but DISABLING the
echo canceller by software AT command. If the echo canceller is left active with the Earphone,
then some echo might be introduced by the echo cancel algorithm.
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9.1.2 Input Lines Characteristics
“MIC_MT” 1st differential microphone path
Line Coupling AC*
Line Type Balanced
Coupling capacitor 100nF
Differential input resistance 50k
Differential input voltage 1,03Vpp (365mVrms)
Microphone nominal sensitivity -45 dBVrms/Pa
Analog gain suggested + 20dB
Echo canceller type Handset
“MIC_HF” 2nd differential microphone path
Line Coupling AC*
Line Type Balanced
Coupling capacitor 100nF
Differential input resistance 50k
Differential input voltage 65mVpp (23mVrms)
Microphone nominal sensitivity -45 dBVrms/Pa
Analog gain suggested +10dB
Echo canceller type Car kit hands-free
(*) WARNING: AC means that the signals from microphone has to be connected to input lines
of the module by a CAPACITOR, which value must be 100nF. Not respecting this constraint,
the input stage will be damaged.
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9.2 OUTPUT LINES (Speaker)
9.2.1 Short description
The Telit GE864-QUAD V2 provides two audio paths in receive section. Only one of the two paths
can be active at a time, selectable by AXE hardware line or by AT command.
You must keep in mind the different audio characteristics of the receive blocks when designing:
Æ the EAR_MTlines EPN1 and EPP1 are the Differential Line-Out Drivers ; they can drive an
external amplifier or directly a 16 earpiece at –12dBFS (*) ;
Æ the “EAR_HF lines EPPA1_2 and EPPA2 are the Fully Differential Power Buffers ; they can
directly drive a 16 speaker in differential (balanced) or single ended (unbalanced) operation mode .
(*) FS : acronym of Full Scale. It is equal to 0dB, the maximum Hardware Analog Receive Gain of
BaseBand Chip.
The EAR_MTaudio path should be used for handset function, while the “EAR_HFaudio path is
suited for hands-free function (car kit).
Both receiver outputs are B.T.L. type (Bridged Tie Load) and the OEM circuitry shall be designed
bridged to reduce the common mode noise typically generated on the ground plane and to get the
maximum power output from the device; however also a single ended circuitry can be designed for
particular OEM application needs.
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9.2.2 Output Lines Characteristics
“EAR_MT” Differential Line-out Drivers Path
Line Coupling DC
Line Type Bridged
Output load resistance 14
Internal output resistance 4 (typical)
Signal bandwidth 150 – 4000 Hz @ -3 dB
Differential output voltage 328mVrms /16 @ -12dBFS
SW volume level step - 2 dB
Number of SW volume steps 10
“EAR_HF” Power Buffers Path
Line Coupling DC
Line Type Bridged
Output load resistance 14
Internal output resistance 4 ( >1,7 )
Signal bandwidth 150 – 4000 Hz @ -3 dB
Max Differential output voltage 1310 mVrms (typ, open circuit)
Max Single Ended output voltage 656 mVrms (typ, open circuit)
SW volume level step - 2 dB
Number of SW volume steps 10
For more detailed information about audio please refer to the Audio Settings Application Note
80000NT10007a.
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10 General Purpose I/O
The general purpose I/O pads can be configured to act in three different ways:
input
output
alternate function (internally controlled)
Input pads can only be read and report the digital value (high or low) present on the pad at the read
time; output pads can only be written or queried and set the value of the pad output; an alternate
function pad is internally controlled by the GE864-QUAD V2 firmware and acts depending on the
function implemented. For Logic levels please refer to chapter 7.
The following GPIO are available on the GE864-QUAD V2:
Ball Signal I/O Function Type
Input /
output
current
Default
State
State
during
Reset
Note
B3 GPIO_04 I/O GPIO04 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x Alternate function (RF
Transmission Control)
B5 GPIO_06 I/O GPIO06 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT HIGH
(see Fig.01)
Alternate function
(ALARM)
E6 GPIO_01 I/O GPIO01 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x Alternate function (JDR)
H3 GPIO_08 I/O GPIO08 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_TX
H5 GPIO_02 I/O GPIO02 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_WAO
K7 GPIO_03 I/O GPIO03 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM_RX
K8 GPIO_05 I/O GPIO05 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x Alternate function
(RFTXMON)
L9 GPIO_07 I/O GPIO07 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x Alternate function
(BUZZER)
D7 GPIO_09 /
PCM_CLK I/O GPIO09 Configurable GPIO CMOS 2.8V 1uA / 1mA INPUT x PCM audio *
x = undefined status
Not all GPIO pads support all these three modes:
GPIO1 supports all three modes and can be input, output, Jamming Detect Output (Alternate
function)
GPIO4 supports all three modes and can be input, output, RF Transmission Control (Alternate
function)
GPIO5 supports all three modes and can be input, output, RFTX monitor output (Alternate
function)
GPIO6 supports all three modes and can be input, output, alarm output (Alternate function)
GPIO7 supports all three modes and can be input, output, buzzer output (Alternate function)
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10.1 GPIO Logic levels
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels.
The following table shows the logic level specifications used in the GE864-QUAD V2 interface circuits:
Absolute Maximum Ratings
Parameter Min Max
Input level on any digital pin when on -0.3V +3.1V
Input voltage on analog pins when on -0.3V +3.0 V
Operating Range - Interface levels (2.8V CMOS)
Level Min Max
Input high level 2.1V 3.1V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 1,8V signals:
Operating Range - Interface levels (1.8V CMOS)
Level Min Max
Input high level 1.6V 2.2V
Input low level 0V 0.4V
Output high level 1,65V 2.2V
Output low level 0V 0.35V
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10.2 Using a GPIO Pad as INPUT
The GPIO pads, when used as inputs, can be connected to a digital output of another device and
report its status, provided this device has interface levels compatible with the 2.8V CMOS levels of the
GPIO.
If the digital output of the device to be connected with the GPIO input pad has interface levels different
from the 2.8V CMOS, then it can be buffered with an open collector transistor with a 47K pull up to
2.8V.
10.3 Using a GPIO Pad as OUTPUT
The GPIO pads, when used as outputs, can drive 2.8V CMOS digital devices or compatible hardware.
When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be
omitted.
10.4 Using the RF Transmission Control GPIO4
The GPIO4 pin, when configured as RF Transmission Control Input, permits to disable the Transmitter
when the GPIO is set to Low by the application.
In the design is necessary to add a pull up resistor (47K to PWRMON);
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10.5 Using the RFTXMON Output GPIO5
The GPIO5 pin, when configured as RFTXMON Output, is controlled by the GE864-QUAD V2 module
and will rise when the transmitter is active and fall after the transmitter activity is completed.
The TXMON pin behaviour can be configured using the AT command.
# TXMONMODE
Refer to AT Commands Reference Guide 80000ST10025a for the full description of this command.
For example, if a call is started, the line will be HIGH during all the conversation and it will be again
LOW after hanged up.
The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1sec after
last TX burst.
10.6 Using the Alarm Output GPIO6
The GPIO6 pad, when configured as Alarm Output, is controlled by the GE864-QUAD V2 module and
will rise when the alarm starts and fall after the issue of a dedicated AT command.
This output can be used to power up the GE864-QUAD V2 controlling microcontroller or application at
the alarm time, giving you the possibility to program a timely system wake-up to achieve some
periodic actions and completely turn off either the application and the GE864-QUAD V2 during sleep
periods, dramatically reducing the sleep consumption to few μA.
In battery-powered devices this feature will greatly improve the autonomy of the device.
NOTE: During RESET the line is set to HIGH logic level.
10.7 Using the Buzzer Output GPIO7
The GPIO7 pad, when configured as Buzzer Output, is controlled by the GE864-QUAD V2 module
and will drive with appropriate square waves a Buzzer driver.
This permits to your application to easily implement Buzzer feature with ringing tones or melody
played at the call incoming, tone playing on SMS incoming or simply playing a tone or melody when
needed by your application.
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A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the
GPIO7:
NOTE: To correctly drive a buzzer a driver must be provided, its characteristics depend on the Buzzer and for them
refer to your buzzer vendor.
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10.8 Indication of network service availability
The STAT_LED pin status shows information on the network service availability and Call status.
In the GE864-QUAD V2 modules, the STAT_LED usually needs an external transistor to drive an
external LED.
Therefore, the status indicated in the following table is reversed with respect to the pin status.
LED status Device Status
Permanently off Device off
Fast blinking
(Period 1s, Ton 0,5s)
Net search / Not registered /
turning off
Slow blinking
(Period 3s, Ton 0,3s)
Registered full service
Permanently on a call is active
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10.9 RTC Bypass out
The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital
part, allowing having only RTC going on when all the other parts of the device are off.
To this power output a backup capacitor can be added in order to increase the RTC autonomy during
power off of the battery. NO Devices must be powered from this pin.
10.10 External SIM Holder Implementation
Please refer to the related User Guide (SIM Holder Design Guides, 80000NT10001a).
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11 DAC and ADC section
11.1 DAC Converter
11.1.1 Description
The GE864-QUAD V2 module provides a Digital to Analog Converter. The signal (named DAC_OUT)
is available on BGA Ball C7 of the GE864-QUAD V2 module and on pin 17 of PL102 on EVK2 Board
(CS1302).
The on board DAC is a 10-bit converter, able to generate a analogue value based a specific input in
the range from 0 up to 1023. However, an external low-pass filter is necessary
Min Max Units
Voltage range (filtered) 0 2,6 Volt
Range 0 1023 Steps
The precision is 10 bits so, if we consider that the maximum voltage is 2V, the integrated voltage could
be calculated with the following formula:
Integrated output voltage = 2 * value / 1023
DAC_OUT line must be integrated (for example with a low band pass filter) in order to obtain an
analog voltage.
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11.1.2 Enabling DAC
An AT command is available to use the DAC function.
The command is AT#DAC[=<enable>[,<value>]]
<value> - scale factor of the integrated output voltage (0..1023 – 10 bit precision)
it must be present if <enable>=1
Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.
NOTE: The DAC frequency is selected internally. D/A converter must not be used during
POWERSAVING.
11.1.3 Low Pass Filter Example
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11.2 ADC Converter
11.2.1 Description
The on board A/D are 11-bit converter. They are able to read a voltage level in the range of 0÷1.9
volts applied on the ADC pin input, store and convert it into 11 bit word.
Min Max Units
Input Voltage range 0 1.9 Volt
AD conversion - 11 bits
Resolution - < 1 mV
The GE864-QUAD V2 module provides 2 Analog to Digital Converters. The input lines are:
ADC_IN1 available on Ball J11 and Pin 19 of PL102 on EVK2 Board.
ADC_IN2 available on Ball H11 and Pin 20 of PL102 on EVK2 Board.
11.2.2 Using ADC Converter
An AT command is available to use the ADC function.
The command is AT#ADC=1,2
The read value is expressed in mV
Refer to SW User Guide or AT Commands Reference Guide for the full description of this function.
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11.3 Mounting the GE864-QUAD V2 on your Board
11.3.1 General
The Telit GE864-QUAD V2 modules have been designed in order to be compliant with a standard lead-free
SMT process.
11.3.2 Module finishing & dimensions
Lead-free Alloy:
Surface finishing Sn/Ag/Cu for all solder pads
Pin A1
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11.3.3 Recommended foot print for the application (GE864)
Top View
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11.3.4 Debug of the GE864 in production
To test and debug the mounting of the GE864, we strongly recommend to foreseen test pads on the
host PCB, in order to check the connection between the GE864 itself and the application and to test
the performance of the module connecting it with an external computer. Depending by the customer
application, these pads include, but are not limited to the following signals:
TXD
RXD
ON/OFF
RESET
GND
VBATT
TX_TRACE
RX_TRACE
PWRMON
11.3.5 Stencil
Stencil’s apertures layout can be the same of the recommended footprint (1:1), we suggest a
thickness of stencil foil 120µm.
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11.3.6 PCB pad design
Non solder mask defined” (NSMD) type is recommended for the solder pads on the PCB.
Recommendations for PCB pad dimensions
Ball pitch [mm] 2,5
Solder resist opening diameter A [mm] 1,150
Metal pad diameter B [mm] 1 ± 0.05
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It is not recommended to place via or microvia not covered by solder resist in an area of 1,6mm
diameter around the pads unless it carries the same signal of the pad itself. (see following figure).
Holes in pad are allowed only for blind holes and not for through holes.
Recommendations for PCB pad surfaces:
Finish Layer thickness [µm] Properties
Electro-less Ni /
Immersion Au
3 –7 /
0.05 – 0.15
good solder ability protection, high
shear force values
The PCB must be able to resist the higher temperatures which are occurring at the lead-free process.
This issue should be discussed with the PCB-supplier. Generally, the wettability of tin-lead solder
paste on the described surface plating is better compared to lead-free solder paste.
11.3.7 Solder paste
Lead free
Solder paste Sn/Ag/Cu
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11.3.8 GE864 Solder reflow
The following is the recommended solder reflow profile
Profile Feature Pb-Free Assembly
Average ramp-up rate (TL to TP) 3°C/second max
Preheat
– Temperature Min (Tsmin)
– Temperature Max (Tsmax)
– Time (min to max) (ts)
150°C
200°C
60-180 seconds
Tsmax to TL
– Ramp-up Rate
3°C/second max
Time maintained above:
– Temperature (TL)
– Time (tL)
217°C
60-150 seconds
Peak Temperature (Tp) 245 +0/-5°C
Time within 5°C of actual Peak
Temperature (tp)
10-30 seconds
Ramp-down Rate 6°C/second max.
Time 25°C to Peak Temperature 8 minutes max.
NOTE: All temperatures refer to topside of the package, measured on the package body surface.
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11.4 Packing system
The Telit GE864 modules are packaged on trays of 20 pieces each. This is especially suitable for the
GE864 according to SMT processes for pick & place movement requirements.
The size of the tray is: 329 x 176mm
NOTE: These trays can withstand at the maximum temperature of 65° C.
Section A-A
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11.4.1 GE864 orientation on the tray
11.4.2 Moisture sensibility
The level of moisture sensibility of GE864 module is “3”, in according with standard IPC/JEDEC J-STD-
020, take care all the relatives requirements for using this kind of components.
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12 Conformity Assessment Issues
The GE864-QUAD V2 module is assessed to be conform to the R&TTE Directive as stand-alone
products, so If the module is installed in conformance with Dai Telecom installation instructions require
no further evaluation under Article 3.2 of the R&TTE Directive and do not require further involvement
of a R&TTE Directive Notified Body for the final product.
In all other cases, or if the manufacturer of the final product is in doubt then the equipment integrating
the radio module must be assessed against Article 3.2 of the R&TTE Directive.
In all cases assessment of the final product must be made against the Essential requirements of the
R&TTE Directive Articles 3.1(a) and (b), safety and EMC respectively, and any relevant Article 3.3
requirements.
The GE864-QUAD V2 module is conform with the following European Union Directives:
R&TTE Directive 1999/5/EC (Radio Equipment & Telecommunications Terminal Equipments)
Low Voltage Directive 73/23/EEC and product safety
Directive 89/336/EEC for conformity for EMC
In order to satisfy the essential requisite of the R&TTE 99/5/EC directive, the GE864-QUAD V2
module is compliant with the following standards:
GSM (Radio Spectrum). Standard: EN 301 511 and 3GPP 51.010-1
EMC (Electromagnetic Compatibility). Standards: EN 301 489-1 and EN 301 489-7
LVD (Low Voltage Directive) Standards: EN 60 950
In this document and the Hardware User Guide, Software User Guide all the information you may
need for developing a product meeting the R&TTE Directive is included.
The GE864-QUAD V2 module is conform with the following US Directives:
Use of RF Spectrum. Standards: FCC 47 Part 24 (GSM 1900)
EMC (Electromagnetic Compatibility). Standards: FCC47 Part 15
To meet the FCC's RF exposure rules and regulations:
- The system antenna(s) used for this transmitter must be installed to provide a separation
distance of at least 20 cm from all the persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
- The system antenna(s) used for this module must not exceed 1.4dBi @900, 3dBi @1800, 1.4dBi
@850 and 3dBi @1900 gain for mobile and fixed or mobile operating configurations.
- Users and installers must be provided with antenna installation instructions and transmitter
operating conditions for satisfying RF exposure compliance.
Manufacturers of mobile, fixed or portable devices incorporating this module are advised to clarify
any regulatory questions and to have their complete product tested and approved for FCC
compliance.
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13 SAFETY RECOMMANDATIONS
READ CAREFULLY
Be sure the use of this product is allowed in the country and in the environment required. The use of
this product may be dangerous and has to be avoided in the following areas:
Where it can interfere with other electronic devices in environments such as hospitals, airports,
aircrafts, etc
Where there is risk of explosion such as gasoline stations, oil refineries, etc
It is responsibility of the user to enforce the country regulation and the specific environment regulation.
Do not disassemble the product; any mark of tampering will compromise the warranty validity.
We recommend following the instructions of the hardware user guides for a correct wiring of the
product. The product has to be supplied with a stabilized voltage source and the wiring has to be
conforming to the security and fire prevention regulations.
The product has to be handled with care, avoiding any contact with the pins because electrostatic
discharges may damage the product itself. Same cautions have to be taken for the SIM, checking
carefully the instruction for its use. Do not insert or remove the SIM when the product is in power
saving mode.
The system integrator is responsible of the functioning of the final product; therefore, care has to be
taken to the external components of the module, as well as of any project or installation issue,
because the risk of disturbing the GSM network or external devices or having impact on the security.
Should there be any doubt, please refer to the technical documentation and the regulations in force.
Every module has to be equipped with a proper antenna with specific characteristics. The antenna has
to be installed with care in order to avoid any interference with other electronic devices and has to
guarantee a minimum distance from the body (20 cm). In case of this requirement cannot be satisfied,
the system integrator has to assess the final product against the SAR regulation EN 50360.
The European Community provides some Directives for the electronic equipments introduced on the
market. All the relevant information’s are available on the European Community website:
http://europa.eu.int/comm/enterprise/rtte/dir99-5.htm
The text of the Directive 99/05 regarding telecommunication equipments is available, while the
applicable Directives (Low Voltage and EMC) are available at:
http://europa.eu.int/comm/enterprise/electr_equipment/index_en.htm
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14 Document Change Log
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ISSUE#0 01/07/08 First Release from rev 7 of 1vv0300779
ISSUE#0.1 24/11/09 Antenna Gain values changed at section 6 and 12.

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